Diego Giberto

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• PhD in Biology
• Researcher at the Benthic Lab at Instituto Nacional de Investigacion y Desarrollo Pesquero

This study deals with the spatial distribution of macrobenthic communities (biomass and abundance) in the Rı́o de la Plata estuary, Argentina–Uruguay, and the adjacent shelf waters. The benthic invertebrates were caught with an epibenthic dredge (41 samples). Multivariate analysis (cluster, MDS), SIMPER and BIO-ENV analyses were applied to analyze...

In this study, we analyse spatial patterns of macrobenthic communities of the Río de la Plata system, and assess the species turnover or beta diversity and its relationship with environmental gradients. Macrobenthic samples and physico-chemical parameters were collected from 20 sampling sites along a transect of 560 km, including the freshwater (FW...

In this study we describe the feeding biology of the exotic predatory whelk Rapana venosa from the Rıó de la Plata when offered representative coastal bivalves from both soft and hard bottoms. Furthermore, we estimate daily consumption rates using two mussel species commonly found on local rocky outcrops and artificial reefs. R. venosa gastropods (...

Esta contribución organiza y compila información mayormente obtenida cumpliendo objetivos vinculados con estudios ambientales desarrollados en el marco de las investigaciones sobre recursos pesqueros, a bordo de los Buques de Investigación Capitán Cánepa, Oca Balda y Eduardo Holmberg del Instituto Nacional de Investigación y Desarrollo Pesquero. La...

Although the shelf-break frontal region covers a distance of around 2000 kilometers, past studies of the benthic organisms mostly included information based on qualitative surveys with a narrow geographic scope. The body of knowledge has been expanding over the past few decades, leading to current attempts towards an all-encompassing ecosystemic ap...

CAPÍTULO 10. El Golfo San Jorge como área prioritaria de investigación, manejo y conservación en el marco de la Iniciativa Pampa Azul. El Golfo San Jorge (GSJ) fue incluido como una de las áreas geográficas prioritarias en el marco de la Iniciativa Pampa Azul por ser una de las regiones más productivas y con mayor diversidad del Mar Argentino. La...

Assessing the ecological role of ctenophores is crucial to understanding ecosystem functioning, including the recruitment of fish stocks. During austral summer in the North Patagonia Ecosystem (NPE) (41−48° S), the ctenophores Mnemiopsis leidyi and Pleurobrachia pileus cooccur with the peak of ichthyoplankton abundance of 2 important fishing resour...

Ancient and modern marine environments are usually characterized by colonizers associated with living and dead organisms, as well as inorganic substrates. There are different terminologies to characterize these colonizations, i.e., if the roots of the terms refer to the colonizer or the colonized substrate. The terminology stated by Paul D. Taylor...

The invertebrate by-catch of the Argentinean squid Illex argentinus collected by bottom trawls off San Jorge Gulf during an expedition performed in December 2020 was employed to characterize the bottom assemblages of the area, with special emphasis on sponges. According to the results, sponges were conspicuous and abundant components in these benth...

El Golfo San Jorge (GSJ) fue incluido como una de las áreas geográficas prioritarias en el marco de la Iniciativa Pampa Azul por ser una de las regiones más productivas y con mayor diversidad del Mar Argentino. La región es clave en el ciclo de vida de los recursos pesqueros más importantes de Argentina y cuenta con áreas protegidas destinadas a la...

Prey selection and feeding strategy of the Argentine hake Merluccius hubbsi were investigated by analyzing the diet and prey availability in the main nursery area of the Patagonian stock (42.4°-46.4 °S, 70-102 m depth). Stomach contents from fish captured using a bottom trawl net, and zooplankton samples collected with a Bongo net, were analyzed. A...

Las primeras campañas de investigación pesquera y oceanográfica en la plataforma continental se realizaron a partir de la década de 1960 en cooperación con países extranjeros, sobre la base de convenios bilaterales. Se destacaron especialmente las de los buques de investigación Shinkai Maru (Japón) y Walther Herwig (Alemania), dado que brindaron in...

Los capítulos precedentes hacen referencia a sistemas bentónicos que en diferente medida sustentan pesquerías de arrastre, demersal o de fondo, en diversas áreas de la plataforma continental argentina. En las mismas, el INIDEP ha llevado a cabo investigaciones sobre el bentos en el marco de los proyectos de evaluación de dichos recursos pesqueros....

En este capítulo se presentan de manera sinóptica los trabajos bentónicos submareales desarrollados en las diferentes regiones del Río de la Plata y zonas marinas adyacentes por el Laboratorio de Bentos del INIDEP a partir de mediados de los años ‘90. Se espera de esta manera lograr una mejor comprensión ecosistémica de las comunidades bentónicas d...

Los fondos duros proveen un número importante de hábitats para distintas asociaciones de peces e invertebrados bentónicos, convirtiéndose de esta manera en zonas de alto interés tanto por su importancia pesquera como para la conservación de la biodiversidad marina. En este capítulo se presenta información sobre los estudios llevados a cabo en el La...

En las diferentes regiones del Golfo San Jorge y el litoral de la provincia de Chubut se ha desarrollado históricamente una gran cantidad de investigaciones biológico-pesqueras, debido fundamentalmente a la presencia de dos de los recursos pesqueros más importantes del país: la merluza común Merluccius hubbsi y el langostino patagónico Pleoticus mu...

Se condensan los principales trabajos realizados en el Laboratorio de Bentos del INIDEP sobre la ecología trófica de diferentes especies de peces óseos y cartilaginosos de Argentina, habitualmente llevadas a cabo en colaboración con diferentes grupos de investigación del INIDEP y de otras instituciones.

A well-replicated decadal-term (2005–2014) stomach content data set was analysed in order to infer inter-annual fluctuations in the diet of the Argentine hake, Merluccius hubbsi, an opportunistic predator in the San Jorge Gulf (SJG) ecosystem in the Southwest Atlantic. Ten research cruises were carried out each year during January from 2005 to 2014...

This study compared the composition and frequency of encrusting, boring and vagile organisms or ‘sclerobionts’ on two patagonian oysters: Ostrea puelchana d’orbigny (Recent) and Ostrea alvarezii d’orbigny (Miocene). The structure of sclerobiontic assemblages and its preferential recruitment on left/right valves and their xternal/internal surfaces w...

Biological data were collected in a Patagonian scallop fishing ground, between 39°00' and 39°50' S and between 87 and 130 m depth. During 2007, we sampled the following stations where the trawling exerted could be precisely determined: 11 locations subjected to continuous fishing effort between 1996 and 2006 (continuous fishing effort, 878 commerci...

Diversity of benthic communities in the recruitment areas of common hake Merluccius hubbsi Marini, 1933. The environmental and biological traits of fishes recruitment and nursery areas play a key role in their survival. In that context , the aim of this work was to characterize the diversity of macrobenthic communities linked to young-of-the-year c...

Como parte del estudio de las posibilidades de desarrollo de una pesquería de medusas en la Argentina se estudió la composición proximal de Lychnorhiza lucerna, única especie que presenta actualmente el potencial de ser explotada comercialmente en Argentina.

El presente capítulo compila aspectos generales de Rapana venosa (Neogastropoda, Muricidae), así como información relativa a enfoques ecológicos y socio-económicos sobre el mencionado caracol invasor desarrollados recientemente en el Río de la Plata y zonas costeras adyacentes. Igualmente se identifican actores, herramientas y medidas de control y/...

Recent range extensions of R. venosa along the Argentine coastline are presented (2010-2013), including the finding of an individual in Mar Chiquita lagoon (200 km southwards of the Río de la Plata). We discuss potential mechanisms for this expansion. Se presentan los registros más recientes de R. venosa a lo largo de la línea costera de Argentin...

The gastropod Rapana venosa is one of most conspicuous exotic species in the Río de la Plata, inhabiting mixohaline and marine waters. The invasion to the adjacent waters of the region can be boosted by propagule pressure. The planktonic larvae of R. venosa is capable of endure 20 to 80 days in the water column. So to determine the potential expans...

The gastropod Rapana venosa is one of most conspicuous exotic species in the Río de la Plata, inhabiting mixohaline and marine waters. The invasion to the adjacent waters of the region can be boosted by propagule pressure. The planktonic larvae of R. venosa is capable of endure 20 to 80 days in the water column. So to determine the potential expans...

Estimate of intake rates of Mnemiopsis leidyi (Ctenophora: Lobata) under laboratory conditions. The first results in the development of a standardized methodology to estimate Mnemiopsis leidyi intake rates and their impact on fish recruitment are presented. M. leidyi capability to consume lyophilized fish eggs and level of consumption of such type...

We report the association between the jellyfish Lychnorhiza lucerna and the crab Cyrtograpsus affinis. Numerous examples of associations between medusae and brachyurans have been observed in the field and noted in the literature. All of these cases involve medusae of the Class Scyphozoa and crabs belonging to the families Majidae and Portunidae. Th...

Herein, we characterize a symbiotic relationship between the scyphomedusa Lychnorhiza lucerna and the decapod crustacean Libinia spinosa in Rıo de la Plata, South America. Of 843 specimens of L. lucerna examined during the study, 69 (8.2 %) hosted L. spinosa within subgenital spaces. The broad spatial and temporal scale of the study, together with...

We studied individual traits related to the sexual reproduction of Lychnorhiza lucerna and reviewed earlier studies of sexual maturation in scyphomedusae, focusing on non-brooding species. Lychnorhiza lucerna is a gonochoric species and sexual dimorphism was noted in the gonadal colour. There were no brooding structures or any other distinguishable...

Competition for food could be a major force driving changes in the community structure of skates (Rajidae) subjected to fishing exploitation. Under this hypothesis, small skates are released from competition with larger skates after fishing has depleted the larger species. Here, we compare the abundance patterns of two sympatric skates with similar...

Competition for food could be a major force driving changes in the community structure of skates (Rajidae) subjected to fishing exploitation. Under this hypothesis, small skates are released from competition with larger skates after fishing has depleted the larger species. Here, we compare the abundance patterns of two sympatric skates with similar...

SUMMARY. The pacific oyster Crassostrea gigas (Thunberg 1793) in Buenos Aires: natural recruitments in Samborombón bay. The Pacific oyster Crassostrea gigas is one of the most successful invasive species worldwide, inhabiting intertidal and shallow subtidal marine and mixohaline coastal waters. In Argentina the species colonized natural ecosystems...

In this study, a Picard dredge was used to sample the benthic community in shelf break frontal areas off Argentina in order to detect species that could be sensitive to fishing activities but are not usually caught during the annual monitoring of Patagonian scallop and associated fauna. The present results show at least 62 taxa not reported previou...

This study describes the macrofaunal assemblages of subtidal rocky reefs off Mar del Plata in order to compare the macro invertebrate assemblages settled on shipwrecks with those of nearby reef sand to characterize the fish fauna associated with natural (NR) and artificial (AR) reefs. Topographic characterizations and surveys of invertebrates and f...

This study describes the macrofaunal assemblages of subtidal rocky reefs off Mar del Plata in order to compare the macro invertebrate assemblages settled on shipwrecks with those of nearby reef sand to characterize the fish fauna associated with natural (NR) and artificial (AR) reefs. Topographic characterizations and surveys of invertebrates and f...

En este trabajo presentamos los primeros pasos en el estudio de las posibilidades de desarrollo de pesquerías de medusas y caracoles en el Río de la Plata. A través del conocimiento de sus historias de vida interpretamos sus patrones de ocurrencia y distribución, sus estrategias reproductivas y su biomasa, para finalmente describir su potencialidad...

The Rio de la Plata (34 degrees 36' 5, 55 degrees 58' W; Argentina and Uruguay) estuary, one of the most important South American estuarine environments, is characterized by weak seasonal freshwater discharge, low tidal amplitude (<1 m), a wide and permanent connection to the sea, and a salt-wedge regime. Using stable isotope analysis, we explored...

Como parte del estudio de las posibilidades de desarrollo de una pesquería de medusas en la Argentina se estudió la composición proximal de Lychnorhiza lucerna, única especie que presenta actualmente el potencial de ser explotada comercialmente. Las campanas de L. lucerna presentan un 97,2±0,4% de humedad, 2,0±0,4% de cenizas, 0,20±0,06% de proteín...

RESUMO Alimentação da corvina Micropogonias furnieri (Sciaenidae; Pisces) no estuário do Rio da Prata e águas costeiras do Uruguai Estudamos a dieta da corvina (Micropogonias furnieri) (Pisces) em distintos regimes de salinidade e tipos de fundo no estuário do Rio da Prata e nas águas costeiras adjacentes do Uruguai. Analisamos 258 conteúdos estoma...

In this study, a Picard dredge was used to sample the benthic community in shelf break frontal areas off Argentina in order to detect species that could be sensitive to fishing activities but are not usually caught during the annual monitoring of Patagonian scallop and associated fauna. The present results show at least 62 taxa not reported previou...

The life history and population dynamics of Lychnorhiza lucerna were studied on populations from Argentina (34-38ºS) and Brazil (25ºS). L. lucerna presents a metagenetic life cycle. The gonochoristic medusae lack brooding structures but exhibit sexual dimorphism in gonad coloration. Fertilization seems to be external. The life span of the medusae i...

This paper provides updated taxonomic knowledge about hydrozoan species and provides ecological information including geographical and bathymetric distributions and biological substrata for the various hydroid assemblages from the Sub-Antarctic Biogeographical Region, mainly Buenos Aires and the Uruguayan coasts. Five of the 41 species found are ne...

Food of Seriola lalandi was mainly composed of juveniles of horse mackerel (Trachurus lathami) (%IRI = 99.66) showing the species as carnivorous feeders predating on small pelagic organisms.

The Rio de la Plata is a large-scale estuary located at 35°S on the Atlantic coast of South America. This system is one of the most important estuarine environments in the continent, being a highly productive area that sustains valuable artisanal and coastal fisheries in Uruguay and Argentina. The main goals of this paper are to summarize recent kn...

The present paper analyses the diet, feeding strategy and niche width of B. macloviana in a sector of the Argentinean Continental Shelf (ACS). Individuals (n = 147) were collected from 43 sampling stations in late summer and autumn 2001. Thirty one alimentary items in the gut contents were found, with a clear dominance of polychaetes. Crustaceans w...

The diet, feeding strategy, and abundance of Psammobatis normani and P. rudis in the southwest Atlantic was investigated to determine whether the species are segregated by habitat or dietary preference. The two coexist along the Argentine continental shelf, but there are differences in abundance. The most important prey for P. normani were crustace...

Beyond their seasonal fluctuations in abundance, jellies seem to be increasing their numbers on the ocean ecosystems. There are, nevertheless, few historical data to support that perception. Furthermore, their contribution to the production of pelagic environments remains uncertain. Distribution, abundance and biomass of jellyfish were studied usin...

We studied the diet of the whitemouth croaker (Micropogonias furnieri) (Pisces) in the Río de la Plata estuary and adjacent Uruguayan coastal waters. Fish were caught at different salinity ranges and bottom types. We analyzed 258 gut contents of whitemouth croaker (6-67 cm total length, TL) and calculated an index of relative importance of prey (IA...

Porifera are a frequently collected taxon in the invertebrate by‐catch of the Patagonian scallop Zygochlamys patagonica (King & Broderip 1832) fishery. In order to prevent the destruction of the exploited environments in the Argentine Sea, it is important to know in detail the taxonomic composition of the benthic assemblages. We present here the fi...

Polychaete assemblages were studied from samples taken in the Southwestern Atlantic, between 34°S and 38°S (Argentinean. Biogeographical Province) during 1993, 2001 and 2002 from a series of oceanographic cruises in mixohaline to oceanic waters. Polychaetes represented almost 25% (number of taxa) of the macrobenthic assemblages; 57 taxa correspondi...

Recent range extensions of the invasive rapa whelk Rapana venosa, biological data of the population and possible ecological impacts on the food webs of the Río de la Plata estuary are presented. A total of 41 rapa whelks and 21 egg capsules were collected between February 2004 and March 2006. Specimens were found all over the mixohaline waters of t...

The Ro de la Plata is one of the main estuarine systems of South America. It is characterized by a salt wedge regime, a well-developed bottom salinity front, and a maximum turbidity zone associated with it. We described, for the first time, the spatial distributional patterns of Neomysis americana, the most abundant mysid and the main food item for...

The present paper analyses the diet, feeding strategy and niche width of B. macloviana in a sector of the Argentinean Continental Shelf (ACS). Individuals (n = 147) were collected from 43 sampling stations in late summer and autumn 2001. Thirty one alimentary items in the gut contents were found, with a clear dominance of polychaetes. Crustaceans w...

Sabellaria bellis Hansen, 1882 y S. wilsoni Lana & Gruet, 1989 fueron registradas en diversos habitats costeros de Uruguay y Argentina, entre 34°S y 37°S, Provincia Biogeográfica Argentina. Se discuten los patrones de distribución local en relación con la hidrografía. Nuestros resultados indican que ambas especies son tolerantes a los cambios de sa...

Sabellaria bellis Hansen, 1882 and S. wilsoni Lana & Gruet, 1989 were recorded in different habitats from coastal localities of Uruguay and Argentina, between 34°S and 37°S, Argentinean Biogeographic Province. Local distribution patterns in relation with the hydrography are discussed. Our findings show that both species are tolerant to salinity cha...

The present paper reports the occurrence of Ebalia rotundata (A. Milne-Edwards, 1880) in marine waters off Argentina and Uruguay, and thus extends its known geographical distribution in the Argentinean Zoogeographical Province more than 700 km northwards. Feasible dispersal mechanisms of this species are discussed. Este trabajo reporta la ocurrenci...

This paper provides an overview of the research being carried out at the moment by a group of Argentinean scientists working on the subjects of marine biodiversity and oceanography. When the idea of the Census of Marine Life (CoML) was proposed following the Symposium held during the IAPSO-IABO conference in Mar del Plata in October 2001, there was...